silverrat | ede4efe8923397c1a2a876da4b847f78791e76b193ab0f84aa08a91fcc76ccef

General

Target

config.exe
Size

41KB
MD5

eec97c1c972c1a4db59f48fe5f590187
SHA1

2e8ad75a10cac16b345f8456c6a0411feea316c5
SHA256

ede4efe8923397c1a2a876da4b847f78791e76b193ab0f84aa08a91fcc76ccef
SHA512

af5c6b9540fdd224cbd1a62051c187198d7413ee237991cbb18339cabb9c79a4c93c44419128c4748cef55fe78454132f05648b4d414900470801b6e42b671a2
SSDEEP

768:+j30TK6jslN1gMMmHoAQP+wpPaLxDiFPF7sm3PRUm9Po2bz1QB6St0dDl:+j30TKEsi6Xg+w01idFVfGm95P1Qofdx

Score

10^/10

silverrat defense_evasion execution persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

Mutex

lAxDBRhAFu

Attributes

certificate
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
decrypted_key
-|S.S.S|-
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
b0FGeVZNcFRMWVloVHR6Z0VESU5RdlpZUmxZbUFE
reconnect_delay
4
server_signature
t9H0tGywaq23QHywsvniYlva2DUEoHwEX4RZOKw6QYOUUUEs6+qPhkwL0ziJc2nYj2yd5E4o3kMJj8NRpRTkpZcyIg/ljsBjIY4uuTgySYNYShSJRrNgQc/XiUXjH546feRdpS3EuZPWH15iNA3U89kmdXU1BOtms28guz5MUZ/jdeGBHbjPJULpyM8EgGGdK3ajqJ+NWQxPHql47XGQFXqJ5PauE0xmpcMKt+LU7fe+NS0Yx11uv+tRwSlMmFhYU9pSYoS8zZ7Lyeaw8rcxs06oecNxLKcmbSH3H5QWo4qYq/Y7HAeBmLEHHB5t8+bCVeDMfccmct8s+aZpljSceGlri2HJsxEjZ7FYmh4+o8bhacTmqQyE99P1kSa4FAWPLn59j5s1nO91Sb/rMvcNUApgatm6ZRZjc+Ninv7rXwFncnT7eRSRvldp7PohX6bsJEJRMnfLT4YxM0TzqV9POSK0hjrRojbiRQWahccxQRKfg3TcVxNnNjCQWMOJ0YzNuQ0ZSTLPO3QA4v/0cwD5nBhPdhowAnMUb4j61HsPdaQnKXvlx377vbMOowWJFqGC1ES1rKn843GMu81HL7FJsfrpqglmmFTddG3IwkeJU7umxj41+anidgCco7Jzbii9D9e4l2DF3EuhYg+qIuiwNw4ACh3olxSGStXl952V/dY=

Signatures

SilverRat
SilverRat is trojan written in C#.
trojan silverrat
Silverrat family
silverrat

Sets file to hidden 1 TTPs 2 IoCs

Modifies file attributes to stop it showing in Explorer etc.

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
4524	attrib.exe
1732	attrib.exe

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1294999112-580688058-1763548717-1000\Control Panel\International\Geo\Nation	OFXsystemSafemode.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1294999112-580688058-1763548717-1000\Control Panel\International\Geo\Nation	config.exe

Executes dropped EXE 1 IoCs

pid	Process
4372	OFXsystemSafemode.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ = "\"C:\\Users\\Admin\\systemSafemode\\OFXsystemSafemode.exe\""	config.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
3004	powershell.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
26	pastebin.com
25	pastebin.com

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
2920	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
2408	schtasks.exe
1412	schtasks.exe

Suspicious behavior: EnumeratesProcesses 24 IoCs

pid	Process
1772	config.exe
1772	config.exe
1772	config.exe
1772	config.exe
1772	config.exe
1772	config.exe
1772	config.exe
1772	config.exe
1772	config.exe
1772	config.exe
1772	config.exe
1772	config.exe
1772	config.exe
1772	config.exe
1772	config.exe
1772	config.exe
1772	config.exe
1772	config.exe
1772	config.exe
1772	config.exe
1772	config.exe
4372	OFXsystemSafemode.exe
3004	powershell.exe
3004	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1772	config.exe
Token: SeDebugPrivilege	4372	OFXsystemSafemode.exe
Token: SeDebugPrivilege	3004	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4372	OFXsystemSafemode.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 1772 wrote to memory of 4524	1772	config.exe	84
PID 1772 wrote to memory of 4524	1772	config.exe	84
PID 1772 wrote to memory of 1732	1772	config.exe	87
PID 1772 wrote to memory of 1732	1772	config.exe	87
PID 1772 wrote to memory of 3012	1772	config.exe	99
PID 1772 wrote to memory of 3012	1772	config.exe	99
PID 3012 wrote to memory of 2920	3012	cmd.exe	101
PID 3012 wrote to memory of 2920	3012	cmd.exe	101
PID 3012 wrote to memory of 4372	3012	cmd.exe	102
PID 3012 wrote to memory of 4372	3012	cmd.exe	102
PID 4372 wrote to memory of 1852	4372	OFXsystemSafemode.exe	103
PID 4372 wrote to memory of 1852	4372	OFXsystemSafemode.exe	103
PID 4372 wrote to memory of 2408	4372	OFXsystemSafemode.exe	105
PID 4372 wrote to memory of 2408	4372	OFXsystemSafemode.exe	105
PID 4372 wrote to memory of 3828	4372	OFXsystemSafemode.exe	107
PID 4372 wrote to memory of 3828	4372	OFXsystemSafemode.exe	107
PID 4372 wrote to memory of 3004	4372	OFXsystemSafemode.exe	109
PID 4372 wrote to memory of 3004	4372	OFXsystemSafemode.exe	109
PID 4372 wrote to memory of 1412	4372	OFXsystemSafemode.exe	110
PID 4372 wrote to memory of 1412	4372	OFXsystemSafemode.exe	110

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

Views/modifies file attributes 1 TTPs 2 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
4524	attrib.exe
1732	attrib.exe

C:\Users\Admin\AppData\Local\Temp\config.exe
"C:\Users\Admin\AppData\Local\Temp\config.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1772
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\systemSafemode"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:4524
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\systemSafemode\OFXsystemSafemode.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:1732
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp5E7.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3012
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2920
- - C:\Users\Admin\systemSafemode\OFXsystemSafemode.exe
    "C:\Users\Admin\systemSafemode\OFXsystemSafemode.exe"
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4372
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN OFXsystemSafemode.exe
      4⤵
      PID:1852
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "OFXsystemSafemode.exe" /TR "C:\Users\Admin\systemSafemode\OFXsystemSafemode.exe \"\OFXsystemSafemode.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2408
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN OFXsystemSafemode.exe
      4⤵
      PID:3828
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -ExclusionExtension exe,bat,dll,ps1;exit
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:3004
  - - C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /sc daily /tn "OFXsystemSafemode_Task-DAILY-21PM" /TR "%MyFile%" /ST 21:00
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:1412

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Hide Artifacts

2

T1564

Hidden Files and Directories

Modify Registry

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_hsllgzyh.hcg.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp5E7.tmp.bat

Filesize
159B

MD5
a18d76c89fecf5c2d842ad5f58a1a5cd

SHA1
b562a7fd56fd876804d55e7be9651f044dcb17f9

SHA256
cab62174d99318ace5b72d074256d8ca3d514b9f4a17fc4a75a2b06a34590e9a

SHA512
db5c853c63cd7f5ebd457097ecfa1457252b16606bf0703f27305e414fe3e90803817c15ff0b43cc24ac1cca4d5a1a79360518b6d36f11d0d9f9837e2159dcf3

Download Submit
C:\Users\Admin\systemSafemode\OFXsystemSafemode.exe

Filesize
41KB

MD5
eec97c1c972c1a4db59f48fe5f590187

SHA1
2e8ad75a10cac16b345f8456c6a0411feea316c5

SHA256
ede4efe8923397c1a2a876da4b847f78791e76b193ab0f84aa08a91fcc76ccef

SHA512
af5c6b9540fdd224cbd1a62051c187198d7413ee237991cbb18339cabb9c79a4c93c44419128c4748cef55fe78454132f05648b4d414900470801b6e42b671a2

Download Submit
memory/1772-0-0x00007FF8DA963000-0x00007FF8DA965000-memory.dmp

Filesize
8KB

Download
memory/1772-1-0x0000000000720000-0x000000000072E000-memory.dmp

Filesize
56KB

Download
memory/1772-2-0x00007FF8DA960000-0x00007FF8DB421000-memory.dmp

Filesize
10.8MB

Download
memory/1772-4-0x00007FF8DA963000-0x00007FF8DA965000-memory.dmp

Filesize
8KB

Download
memory/1772-5-0x00007FF8DA960000-0x00007FF8DB421000-memory.dmp

Filesize
10.8MB

Download
memory/1772-10-0x00007FF8DA960000-0x00007FF8DB421000-memory.dmp

Filesize
10.8MB

Download
memory/3004-13-0x000001B2D7170000-0x000001B2D7192000-memory.dmp

Filesize
136KB

Download
memory/4372-12-0x00007FF8DA960000-0x00007FF8DB421000-memory.dmp

Filesize
10.8MB

Download
memory/4372-25-0x00007FF8DA960000-0x00007FF8DB421000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads